 | Francis Cuthbertson - Euclid's Elements - 1874 - 400 pages
...ACE, BCE are equal in all respects, and.-. AE is =BE; (i. i) ( 14 ) RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight line,...the adjacent angles equal to one another, each of them is called a right angle; and the straight line which stands upon the other is said to be perpendicular... | |
 | Euclides - 1874 - 342 pages
...only one angle at a point, it may be expressed by the letter at that point ; as the angle at E. 10. When a straight line standing on another straight line, makes the adjacent angles equal to each other, each of these angles is called a right angle ; and the straight line which stands on the... | |
 | George Elliot Voyle, G. de Saint-Clair-Stevenson - English language - 1876 - 676 pages
...barracks, &c. The term is also applied to substantive rank (viile Rank) in the army. Perpendicular — When a straight line standing on another straight...angles equal to one another, each of these angles is a right angle, and the line perpendicular. Persian Wheel — A contrivance for raising water from a... | |
 | Edward Atkins - 1876 - 130 pages
...(Const.); Therefore the angle DCF is equal to the angle EOF (I. 8) ; And they are adjacent angles. But when a straight line, standing on another straight...the adjacent angles equal to one another, each of the angles is callccl a. right angle (Def. 10) ; AD = Make CE = CD nnj A DBF equilatcral. * EC*' .... | |
 | Francis Cuthbertson (geometer.) - 1876 - 102 pages
...L DEFis equal to L KEL. Wherefore if two straight lines &c. QED RIGHT ANGLES. DEFINITION. When one straight line, standing on another straight line,...the adjacent angles equal to one another, each of them is called a right angle ; and the straight line which stands upon the other is - said to be perpendicular... | |
 | Robert Potts - Geometry - 1876 - 446 pages
...together, but are not in the same btraight line. D NB If there be only one angle at a point, it may be expressed by a letter placed at that point, as the angle at E : but when several angles are at one point B, either of them is expressed by three letters, of which... | |
 | Isaac Todhunter - Philosophy - 1877 - 452 pages
...said to be perpendicular to the other. This is put into a more precise form in the following manner: when a straight line standing on another straight...the adjacent angles equal to one another, each of the angles is called a right angle, and the 'straight line which stands on the other is called a perpendicular... | |
 | Edward Atkins - 1877 - 72 pages
...(Const.) ; Therefore the angle DCF is equal to the angle ECP (I. 8) ; And they are adjacent angles. But when a straight line, standing on another straight...the adjacent angles equal to one another, each of the angles is called a. right angle (Dcf. 10); Hake CK = CD ami A DF.F cquihiteiul. '. DCF = '! F.Cf.... | |
 | George Frederick Chambers - Astronomy - 1877 - 968 pages
...each other in the same plane gives rise to a plane rectilineal angle, or simply an angle. \Vln 'ii a straight line, standing on another straight line, makes the adjacent angles equal to each other, each of those angles is called a riyht angle ; but if the adjacent angles are not equal... | |
 | Euclides - 1877 - 58 pages
...11) therefore the angle EGC is equal to the angle FGC ; (prop. 8) and they are adjacent angles ; but "when a straight line standing on another straight line makes the adjacent augles equal to one another, the straight line which stands on the other is perpendicular to it." (def.... | |
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When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it. 
